Formula: (Na,K)(Mn,Mn)8O16 . nH2O
Origin of name: For Manjiro Watanabe, Japanese professor
Crystal system: Tetragonal
Crystal class: 4/m
Twinning:
Unit cell:
Colour: Dark brownish gray
Diaphaneity:
Luster: Dull
Habit: Massive, compact
Hardness: 7
Specific gravity: 4.29
Cleavage: None
Tenacity:
Streak: Brownish black
Synonyms/varieties:
Comments:
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